restart: with(RealDomain): # \321\200\320\265\321\210\320\260\320\265\320\274 \320\262 \320\264\320\265\320\271\321\201\321\202\320\262\320\270\321\202\320\265\320\273\321\214\320\275\320\276\320\271 \320\276\320\261\320\273\320\260\321\201\321\202\320\270 _EnvExplicit := true: # \320\264\320\273\321\217 \321\202\320\276\320\263\320\276, \321\207\321\202\320\276\320\261\321\213 \321\204\321\203\320\275\320\272\321\206\320\270\321\217 solve \320\262 \320\276\321\202\320\262\320\265\321\202\320\260\321\205 \320\275\320\265 \320\270\321\201\320\277\320\276\320\273\321\214\320\267\320\276\320\262\320\260\320\273\320\260 RootOf

Warning, these protected names have been redefined and unprotected: Im, Re, `^`, arccos, arccosh, arccot, arccoth, arccsc, arccsch, arcsec, arcsech, arcsin, arcsinh, arctan, arctanh, cos, cosh, cot, coth, csc, csch, eval, exp, expand, limit, ln, log, sec, sech, signum, simplify, sin, sinh, solve, sqrt, surd, tan, tanh

u := (x,y,z) -> x^2 + y^3 + 1/(z-1); f := (x,y,z) -> 25*x^2 + 4*y^2 + 9*z^2 - 1; L := u(x,y,z) - lambda * f(x,y,z); res := [solve( { diff(L, x), diff(L, y), diff(L, z), diff(L, lambda) }, {x,y,z,lambda} )]; x1 = subs( res[1], [x,y,z] ), u1 = subs( res[1], u(x,y,z) ); x2 = subs( res[2], [x,y,z] ), u2 = subs( res[2], u(x,y,z) );

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